With a PersonalWiki you spend a lot of time talking to yourself ... but with delay, so it sounds like someone else. I keep finding pages I wrote last year and thinking "wow! I so agree with what this guy says. How smart is that?"
Ocassionally I find things I wrote which make me question what I think ... eg. TechnologicalDeterminism/In2002
Anyone remember that (maybe) RayBradbury story about a guy marooned on Mars leaving telephone messages for himself in the future, taunting himself? Spooky!!